//图片切换
(function(){


    var $ = function (id) {
	    return "string" == typeof id ? document.getElementById(id) : id;
    };

    var Extend = function(destination, source) {
	    for (var property in source) {
		    destination[property] = source[property];
	    }
	    return destination;
    }

    var CurrentStyle = function(element){
	    return element.currentStyle || document.defaultView.getComputedStyle(element, null);
    }

    var Bind = function(object, fun) {
	    var args = Array.prototype.slice.call(arguments).slice(2);
	    return function() {
		    return fun.apply(object, args.concat(Array.prototype.slice.call(arguments)));
	    }
    }

    var Tween = {
	    Quart: {
		    easeOut: function(t,b,c,d){
			    return -c * ((t=t/d-1)*t*t*t - 1) + b;
		    }
	    },
	    Back: {
		    easeOut: function(t,b,c,d,s){
			    if (s == undefined) s = 1.70158;
			    return c*((t=t/d-1)*t*((s+1)*t + s) + 1) + b;
		    }
	    },
	    Bounce: {
		    easeOut: function(t,b,c,d){
			    if ((t/=d) < (1/2.75)) {
				    return c*(7.5625*t*t) + b;
			    } else if (t < (2/2.75)) {
				    return c*(7.5625*(t-=(1.5/2.75))*t + .75) + b;
			    } else if (t < (2.5/2.75)) {
				    return c*(7.5625*(t-=(2.25/2.75))*t + .9375) + b;
			    } else {
				    return c*(7.5625*(t-=(2.625/2.75))*t + .984375) + b;
			    }
		    }
	    }
    }

SlideTrans = function(container, slider, count, options) {
	this._slider = $(slider);
	this._container = $(container);//容器对象
	this._timer = null;//定时器
	this._count = Math.abs(count);//切换变量
	this._target = 0;//目前值
	this._t = this._b = this._c = 0;
	
	this.Index = 0;//当前索引
	
	this.SetOptions(options);
	
	this.Auto = !!this.options.Auto;
	this.Duration = Math.abs(this.options.Duration);
	this.Time = Math.abs(this.options.Time);
	this.Pause = Math.abs(this.options.Pause);
	this.Tween = this.options.Tween;
	this.onStart = this.options.onStart;
	this.onFinish = this.options.onFinish;
	
	var bVertical = !!this.options.Vertical;
	this._css = bVertical ? "top" : "left";//方向
	
	var p = CurrentStyle(this._container).position;
	p == "relative" || p == "absolute" || (this._container.style.position = "relative");
	this._container.style.overflow = "hidden";
	this._slider.style.position = "absolute";
	
	this.Change = this.options.Change ? this.options.Change :
		this._slider[bVertical ? "offsetHeight" : "offsetWidth"] / this._count;
};
SlideTrans.prototype = {
  //设置默认属性
  SetOptions: function(options) {
	this.options = {//默认值
		Vertical:	true,//是否垂直方向（方向不能改）
		Auto:		true,//是否自动
		Change:		0,
		Duration:	50,//滑动效果时间
		Time:		10,//滑动延迟
		Pause:		2000,//停留时间(Auto?true?有效)
		onStart:	function(){},
		onFinish:	function(){},
		Tween:		Tween.Quart.easeOut
	};
	Extend(this.options, options || {});
  },
  //开始切换
  Run: function(index) {
	//修正index
	index == undefined && (index = this.Index);
	index < 0 && (index = this._count - 1) || index >= this._count && (index = 0);

	this._target = -Math.abs(this.Change) * (this.Index = index);
	this._t = 0;
	this._b = parseInt(CurrentStyle(this._slider)[this.options.Vertical ? "top" : "left"]);
	this._c = this._target - this._b;
	
	this.onStart();
	this.Move();
  },
  //移动
  Move: function() {
	clearTimeout(this._timer);

	if (this._c && this._t < this.Duration) {
		this.MoveTo(Math.round(this.Tween(this._t++, this._b, this._c, this.Duration)));
		this._timer = setTimeout(Bind(this, this.Move), this.Time);
	}else{
		this.MoveTo(this._target);
		this.Auto && (this._timer = setTimeout(Bind(this, this.Next), this.Pause));
	}
  },
  //移动到
  MoveTo: function(i) {
	this._slider.style[this._css] = i + "px";
  },
  //下一张
  Next: function() {
	this.Run(++this.Index);
  },
  //上一张
  Previous: function() {
	this.Run(--this.Index);
  },

  //停止
  Stop: function() {
	clearTimeout(this._timer); this.MoveTo(this._target);
  }
};



})();


function initFocusImgs(id,c,pause,domNum,currClass){
    if(!qpea.$(id)){
        return false;
    }
    var dom = qpea.$(id),domc = qpea.$(c),asNum = qpea.$(domNum);
    var num = domc.getElementsByTagName('a').length;
    if(num == 1){
        return false;
    }
    if(num < 1){
        qpea.$(id).style.display = 'none';
        return false;
    }
    var _asStr = '';
    for(var i=1;i<=num;i++){
        _asStr = _asStr.concat('<a href="#">'+i+'</a>');
    }
    asNum.innerHTML = _asStr;
    var st = new SlideTrans(id,c,num,{Pause:pause});
        st.Index = 0;
        st.nums = asNum.getElementsByTagName('a');
	    for(var i=0,len=st.nums.length;i<len;i++){
		    st.nums[i].onmouseover = (function(o,j){
		        return function(){
				   o.className = currClass;
				   st.Auto = false;
				   st.Run(j);
			    };
		     })(st.nums[i],i);
		   st.nums[i].onmouseout = function(){this.className = '';st.Auto = true;st.Run()};
	    }
	    st.onStart = function(){
	        for(var i = 0,len = st.nums.length;i<len;i++){
	            st.nums[i].className = '';
	        }
	        st.nums[st.Index].className = currClass;
	    }
	    st.Run();
}